Why do astronomers suspect that a supernova explosion occurred near the nebula that gave birth to the solar system

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached

It is increased due to the doppler effect. (apex)

Sertghjnbfdsad oh and me too

Answervery high orbital velocities in a very compact region;